preheating warning light

It's not the glowplugs, they have no effect on the actual control or timing etc. of the relay.

Sounds like a problem with the relay, the connector to the relay, or the wiring. I've had similar before on a Citroen AX and it turned out to be a broken wire near the connector making intermittent contact.

I'd suggest you locate and remove the relay, clean up and visually check all the connections, carefully (visually) check the connector and the wiring loom for damage or breaks, then reinstall the relay and see if your woes go away. If they don't, replace the relay.

This bit of your post doesn't really make a lot of sense.

I think it's unlikely to be anything to do with the glowplugs. A 51 plate car probably has an engine that requires little or no pre-heating unless it's really really cold.

Some vehicles use the glowplug light as the ECU warning light.

Some more detail might help. When it won't start, does the starter turn the engine and it doesn't fire or does nothing happen at all?

They concievable could have - if one has gone short, and blown the glow plug fuse, if it's upstream of the relay/indicator.

You're not going to be able to rule out the other 3 glowplugs unless you change them. Why did you buy new ones anyway if you didn't know they were broken?

Hi there,

The car still sounds really health but doesn't fire. the relay sounds like it is making a clicking noise.

Douglas Payne wrote:

Thanks for your reply it was very helpful. The problem was infact corrosion on the relay. Once this was replaced the car was running good as new.

thanks

Vim Fuego wrote: